科技期刊版面设计与处理的原则

科技期刊版面设计与处理要把握好以下几个原则：规范性原则；艺术性原则；科学性原则，以期达到部分与整体，内容与形式的高度和谐统一；达到传播科技信息，交流学术思想，促进科技成果转化的目的。     

高成形性罐用铝材热变形过程的微观组织观察

用动态热模拟试验技术，对经高效熔体综合处理的高成形性易拉罐用铝材进行高温等温压缩变形试验，并用OM、TEM观察分析了该材料在热变形过程中微观组织特征。结果表明，变形温度和应变速率对该铝材微观组织特征均有显著影响。变形温度低时，仅发生动态曰复，而当变形温度高于400℃时，发生了完全动态再结晶，可获得等轴均匀的晶粒；在较低和高的应变速率条件下。均发生了完全动态再结晶，但这两种条件下存在不同的再结晶机理，而应变速率为1．0s^-1和5．0s^-1时，仅发生动态回复；变形量较小时，显微组织变化不明显，变形量增大后，发生完全动态再结晶，若继续增大变形量，则晶粒组织将被拉长。     

对我国上市公司资产负债率与EVA的思考

资产负债率反映企业的资本结构，对企业财务目标的实现起着重要影响．而笔者认为目前最合理为大家所接受的企业财务管理目标应是经济增加值最大化。本文从分析我国上市公司资产负债率概况入手，论述经济增加值最大化是最为合理的企业财务管理目标，阐明我国上市公司资产负债率与EVA的紧密联系。     

Effects of Hg and Cu on the activities of soil acid phosphatase

Comparative study on the activity and kinectic properties of acid phosphatase (ACPase) of three soils amended with Hg and Cu at constant temperature and humidity was carried out. The results indicated that the inhibition on ACPase of the three sample soils by Hg and Cu varied with the content of soil organic matter and pH, where, Soil 1 was the most seriously contami- nated due to its lowest content of organic matter and the lowest pH among three samples, Soil 2 took the second place, and Soil 3 was the least contaminated. Except Soil 3, the activity of soil ACPase tended to increase along with the contact time under the same type and the same concentration of heavy metal. In particular the Vmax values of ACPase in all three samples decreased with increasing Hg and Cu concentration, whereas the Km values were affected weakly. According to the change of Vmax and Km values, Cu and Hg had the same inhibition effect on soil ACPase. Both of them may be a type of compound of non-competitive and anti-competitive inhibition. Statistic analyses indicated that activities of soil ACPase and Vmax values could serve as bioindicator to partially denote the heavy metal Hg and Cu contamination degree.     

基于S7-1200PLC的金属打包机控制系统研究

利用S7-1200PLC和MCGS触摸屏实现了对液压金属打包机的全自动控制,其中设计了打包环节的部分控制程序,将传送带送料替代人工送料,改翻包出包为前门推包出包。仿真实验表明,系统稳定可靠,安全性和生产效率较高。     

Adsorption of Cu^2 ＋, Zn^2＋ and Cd^2＋ on Bacillus subtilis

A process of biosorption of Cu2 , Zn2 and Cd2 on Bacillus subtilis was investigated. The experiments show that the process of biosorption is quite fast. The maximum adsorption was reached after 5 min and hardly changed with time. The experimental data was analyzed using four sorption kinetic models: the pseudo-first-order, the Ritchie second-order, the modified second-order and the Elovich equations, which helped to determine the best-fit equation for the sorption of metal ions onto biomass. The results show that both the Ritchie second-order and modified second-order equations can fit the experimental data. The Langmuir model is able to accurately describe adsorption of Cu2 and Zn2 on B. subtilis. The experimental data points of adsorption Cd2 and Zn2 on B. subtilis are described by Freundlich isotherms model.     

金属烤瓷修复体602例临床分析

目的 通过对金属烤瓷修复体的追踪检查，总结修复成功的关键要素。方法 常规牙体制备、取印模、灌模、制作暂时冠、比色、试戴、调He、粘固等系列步骤，对602例1512个牙进行金属烤瓷冠修复。结果 通过5个月至5年5个月的追踪检查，发现 其中32个修复体有瓷裂纹或瓷折裂现象(2．1％)，18个修复体边缘不太密合(1．19％)，8个修复体龈缘金属显露(0．5％)，12个修复体发生龈缘炎或龈萎缩(0．75％)，4个修复体发生牙髓炎(0．25％)，10个修复体有食物嵌塞，24个修复体色调、彩度、明度出现偏差。均未见牙颈部继发龋，松动脱落现象。结论 选择适合的基牙，采用正确的备牙方式，合理的颈缘肩台设计，准确的邻接关系，细致的比色与调He，及时制作暂时冠，能使金属烤瓷修复体取得满意的临床效果。     

金属有机化合物在光电磁材料中的应用

本文综述了金属有机化合物在光电磁材料中的应用.     

碱金属氧化物稳定性的讨论

从热力学角度对碱金属的各类氧化物的稳定性进行了讨论。     

碱金属原子光谱精细结构

用半经典方法推得碱金属原子价电子自旋一轨道相互作用能公式、双层能级间隔公式等。从理论计算可知电偶极和电四极极化所引起的精细结构裂距很小。对n=13、l=5的量子态理论值与实验值基本相符。